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Fair Value of Financial Instruments - Gains (losses) Incurred for Assets Measured at Fair Value (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Residential mortgage loans held in securitization trusts – impaired loans, net |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gains (losses) for assets measured at fair value on a non-recurring basis | $ 0 | $ (189) | $ 110 | $ (205)
Real estate owned held in residential securitization trusts |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gains (losses) for assets measured at fair value on a non-recurring basis | $ 0 | $ (6) | $ 0 | $ (6)

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- Definition This item represents the estimated amount of gains or losses included in earnings during the period attributable to changes in instrument-specific credit risk arising from loans and other receivables held as assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 + Details
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